Hello! Maybe someone knows how to solve this problem. When transferring a rig from a scene saved by blender 3.0 to blender 2.9, bones with segments break. Displayed as B-Bone.
This is not the place to report bugs, use Help → Report Bug from within Blender for that.
Having said that, Blender 3.0 files are not guaranteed to be compatible with older versions of Blender, so this wouldn’t be considered a bug.